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<!DOCTYPE html> <html> <body> <h2>JavaScript 数组</h2> <p>length 属性提供了一种无需使用 push() 方法即可将新元素附加到数组的简单方法。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> var fruits = ["香蕉","橙子","苹果","芒果"]; document.getElementById("demo").innerHTML = fruits; function myFunction() { fruits[fruits.length] = "Lemon"; document.getElementById("demo").innerHTML = fruits; } </script> </body> </html>